C programming. Please explain answer.

For the following variable declarations, int *x_pt; long *y_addr; long *dt_addr; long *pt_addr; double *pt_z; int a; long b; double c; determine which of the following statements is valid. (a) y_addr = &a; (b) y addr a; (c) dt addr &a; (d) dt_addr a; (e) pt_2= &a; (f) pt_addr a; (g) y addr =x_pt; (h) y_addr = &b; (i) y_addr = b; 6) dt_addr &b; (k) dt_addr b; (1) pt_addr &b; (m) pt_addr b; (n) y_addr = dt_addr; (0) y_addr = &c; (p) y addr c; (q) da_addr = &c; (r) dt addr c; (8) pt_addr &c; (t) pt_addr c; (u) y_addr = pt_addr